碳纤维和玻璃纤维混杂增强生物基PA56复合材料制备及性能

Preparation and Properties of CF and GF Hybrid Reinforced Bio-based PA56 Composites

通过双螺杆挤出机连续进纤的方式制备出碳纤维(CF)和玻璃纤维(GF)混杂增强生物基PA56复合材料(生物基PA56/CF/GF),研究分析CF与GF不同混杂比对其结构和性能的影响。研究结果表明,所制备的复合材料密度均低于1.5 g/cm^(3),CF与GF纤维在复合体系中与生物基PA56充分黏结在一起;不同混杂比纤维的加入,复合材料的力学性能与纯PA56相比显著提高,当CF与GF体积分数为2∶1混杂时,复合材料的力学性能最佳,拉伸强度为182.2 MPa,是纯生物基PA56的1.48倍;弯曲强度为252.2 MPa,弯曲弹性模量达到13 052 MPa,是纯生物基PA56的1.78倍和3.58倍;缺口冲击强度可以达到9.3 kJ/m^(2),是纯生物基PA56的2.1倍;复合材料的热分解温度略有升高。该复合材料密度低、力学性能优良、热性能稳定,完全符合以塑代钢的绿色理念。综合分析,该复合材料有着较高的附加值,可以应用在风力发电叶片等领域。

Carbon fiber(CF) and glass fiber(GF) hybrid reinforced biobased,polyamide 56(PA56) composites(biobased PA56/CF/GF) were prepared by continuous feeding of fibers through a twin-screw extruder,and the effects of different mixing ratios of CF and GF on the structure and properties of the composites were studied and analyzed.The results show that the density of the prepared composites is lower than 1.5 g/cm^(3),and the CF and GF fibers are fully bonded with the bio-based PA56 in the composite system;the mechanical properties of the composites are significantly improved by the addition of fibers with different mixing ratios compared with the pure PA56,and the mechanical properties of the composites are optimal.When the volume fraction of CF and GF is 2∶1 mixed,the mechanical properties of the composite material are the best,a tensile strength of the composite material is 182.2 MPa,which is 1.48 times that of pure biological PA56.The bending strength is 252.2 MPa,and the bending modulus reaches 13 052 MPa,which is 1.78 times and 3.58 times that of pure biological PA56.The notch impact strength can reach 9.3 kJ/m^(2),which is 2.1 times that of pure biological PA56.And the thermal decomposition temperature of the composites slightly increases.The thermal decomposition temperature of the composite material is slightly elevated.The composite material has low density,excellent mechanical properties and stable thermal properties,which is in full compliance with the green concept of replacing steel with plastic.Comprehensive analysis,the composite material has a high added value,can be used in wind power blades and other fields.